Fix bad interaction between -o and -M in pcre2grep.

ChangeLog

@@ -147,6 +147,10 @@ checked in RunTest.
 pcre2_match.c, in anticipation that this is needed for the same reason it was 
 recently added to pcrecpp.cc in PCRE1.
 
+38. Using -o with -M in pcre2grep could cause unnecessary repeated output when 
+the match extended over a line boundary, as it tried to find more matches "on 
+the same line" - but it was already over the end.
+
 
 Version 10.21 12-January-2016
 -----------------------------

RunGrepTest

@@ -556,6 +556,18 @@ echo "---------------------------- Test 109 -----------------------------" >>tes
 (cd $srcdir; $valgrind $vjs $pcre2grep -cq lazy ./testdata/grepinput*) >>testtrygrep
 echo "RC=$?" >>testtrygrep
 
+echo "---------------------------- Test 110 -----------------------------" >>testtrygrep
+(cd $srcdir; $valgrind $vjs $pcre2grep --om-separator / -Mo0 -o1 -o2 'match (\d+):\n (.)\n' testdata/grepinput) >>testtrygrep
+echo "RC=$?" >>testtrygrep
+
+echo "---------------------------- Test 111 -----------------------------" >>testtrygrep
+(cd $srcdir; $valgrind $vjs $pcre2grep --line-offsets -M 'match (\d+):\n (.)\n' testdata/grepinput) >>testtrygrep
+echo "RC=$?" >>testtrygrep
+
+echo "---------------------------- Test 112 -----------------------------" >>testtrygrep
+(cd $srcdir; $valgrind $vjs $pcre2grep --file-offsets -M 'match (\d+):\n (.)\n' testdata/grepinput) >>testtrygrep
+echo "RC=$?" >>testtrygrep
+
 # Now compare the results.
 
 $cf $srcdir/testdata/grepoutput testtrygrep

src/pcre2grep.c

@@ -1886,7 +1886,7 @@ while (ptr < endptr)
   size_t startoffset = 0;
 
   /* At this point, ptr is at the start of a line. We need to find the length
-  of the subject string to pass to pcre_exec(). In multiline mode, it is the
+  of the subject string to pass to pcre2_match(). In multiline mode, it is the
   length remainder of the data in the buffer. Otherwise, it is the length of
   the next line, excluding the terminating newline. After matching, we always
   advance by the length of the next line. In multiline mode the PCRE2_FIRSTLINE
@@ -2074,14 +2074,22 @@ while (ptr < endptr)
             fprintf(stdout, STDOUT_NL);
           }
 
-        /* Prepare to repeat to find the next match. If the pattern contained a
+        /* Prepare to repeat to find the next match in the line. */
-        lookbehind that included \K, it is possible that the end of the match
-        might be at or before the actual starting offset we have just used. In
-        this case, start one character further on. */
 
         match = FALSE;
         if (line_buffered) fflush(stdout);
         rc = 0;                      /* Had some success */
+
+        /* If the current match ended past the end of the line (only possible
+        in multiline mode), we are done with this line. */
+
+        if (offsets[1] > linelength) goto END_ONE_MATCH;
+
+        /* If the pattern contained a lookbehind that included \K, it is
+        possible that the end of the match might be at or before the actual
+        starting offset we have just used. In this case, start one character
+        further on. */
+
         startoffset = offsets[1];    /* Restart after the match */
         oldstartoffset = pcre2_get_startchar(match_data);
         if (startoffset <= oldstartoffset)
@@ -2786,8 +2794,8 @@ if ((popts & PO_FIXED_STRINGS) != 0)
   }
 
 sprintf((char *)buffer, "%s%.*s%s", prefix[popts], patlen, ps, suffix[popts]);
-p->compiled = pcre2_compile(buffer, -1, options, &errcode, &erroffset,
+p->compiled = pcre2_compile(buffer, PCRE2_ZERO_TERMINATED, options, &errcode, 
-  compile_context);
+  &erroffset, compile_context);
 
 /* Handle successful compile */
 

testdata/grepinput

@@ -604,6 +604,19 @@ AB.VE the turtle
 
 010203040506
 
+match 1:
+ a
+match 2:
+ b
+match 3:
+ c
+match 4:
+ d
+match 5:
+ e
+Rhubarb
+Custard Tart
+
 PUT NEW DATA ABOVE THIS LINE.
 =============================
 

testdata/grepoutput

@@ -10,7 +10,7 @@ RC=0
 7:PATTERN at the start of a line.
 8:In the middle of a line, PATTERN appears.
 10:This pattern is in lower case.
-610:Check up on PATTERN near the end.
+623:Check up on PATTERN near the end.
 RC=0
 ---------------------------- Test 4 ------------------------------
 4
@@ -19,7 +19,7 @@ RC=0
 ./testdata/grepinput:7:PATTERN at the start of a line.
 ./testdata/grepinput:8:In the middle of a line, PATTERN appears.
 ./testdata/grepinput:10:This pattern is in lower case.
-./testdata/grepinput:610:Check up on PATTERN near the end.
+./testdata/grepinput:623:Check up on PATTERN near the end.
 ./testdata/grepinputx:3:Here is the pattern again.
 ./testdata/grepinputx:5:Pattern
 ./testdata/grepinputx:42:This line contains pattern not on a line by itself.
@@ -28,7 +28,7 @@ RC=0
 7:PATTERN at the start of a line.
 8:In the middle of a line, PATTERN appears.
 10:This pattern is in lower case.
-610:Check up on PATTERN near the end.
+623:Check up on PATTERN near the end.
 3:Here is the pattern again.
 5:Pattern
 42:This line contains pattern not on a line by itself.
@@ -324,10 +324,10 @@ RC=0
 ./testdata/grepinput-9-
 ./testdata/grepinput:10:This pattern is in lower case.
 --
-./testdata/grepinput-607-PUT NEW DATA ABOVE THIS LINE.
+./testdata/grepinput-620-PUT NEW DATA ABOVE THIS LINE.
-./testdata/grepinput-608-=============================
+./testdata/grepinput-621-=============================
-./testdata/grepinput-609-
+./testdata/grepinput-622-
-./testdata/grepinput:610:Check up on PATTERN near the end.
+./testdata/grepinput:623:Check up on PATTERN near the end.
 --
 ./testdata/grepinputx-1-This is a second file of input for the pcregrep tests.
 ./testdata/grepinputx-2-
@@ -349,8 +349,8 @@ RC=0
 ./testdata/grepinput-12-Here follows a whole lot of stuff that makes the file over 24K long.
 ./testdata/grepinput-13-
 --
-./testdata/grepinput:610:Check up on PATTERN near the end.
+./testdata/grepinput:623:Check up on PATTERN near the end.
-./testdata/grepinput-611-This is the last line of this file.
+./testdata/grepinput-624-This is the last line of this file.
 --
 ./testdata/grepinputx:3:Here is the pattern again.
 ./testdata/grepinputx-4-
@@ -756,3 +756,34 @@ RC=0
 RC=0
 ---------------------------- Test 109 -----------------------------
 RC=0
+---------------------------- Test 110 -----------------------------
+match 1:
+ a
+/1/a
+match 2:
+ b
+/2/b
+match 3:
+ c
+/3/c
+match 4:
+ d
+/4/d
+match 5:
+ e
+/5/e
+RC=0
+---------------------------- Test 111 -----------------------------
+607:0,12
+609:0,12
+611:0,12
+613:0,12
+615:0,12
+RC=0
+---------------------------- Test 112 -----------------------------
+37168,12
+37180,12
+37192,12
+37204,12
+37216,12
+RC=0